Still have some problems - ahy ideas?

[Mike Rolica]

	Hear any lifter noise?  Lifters may be collapsed when cold, too
thick of oil changing duration, and lift.  Would make higher vacume until
they all pump up.  Are they hydraulic? If so whatkinda preload do you have
on them?.. should be ¾-1 turn after pushrod play is eliminated.

Mike Rolica
Meridian Magnesium Products
Strathroy, Ont 
Ext. 260


	-----Original Message-----
	From:	Roger Heflin [SMTP:rah at horizon.hit.net]
	Sent:	Wednesday, December 08, 1999 12:11 AM
	To:	GMECM
	Subject:	Still have some problems - ahy ideas?


	Ok,

	My car is still not running quite right all of the time.
	Here is what I have.  On a cold start (cold engine) it won't idel
right, I need to manually keep the rpms up.  It will run this way for 5-8
minutes (the IAC will  e maxed at 160, MAP will be somewhere around 18-20),
then all of a sudden the MAP will drop from that range down to 13-15 and the
computer will then be able to control the rpm with the IAC valve (IAC is no
longer maxed).    I don't see (or hear) any obvious vacuum leaks (I did find
and fix one and it did not appear to change the idle).  The exhaust is not
plugged to the best of my knowledge (!cat).   I just cannot figure out what
is causing the vacuum to not be right were it should, and why all of a
sudden the vacuum "fixes" itself.
	Other info: nothing like fans/learn control/closed
loop/AC/Air/Canister Purge/EGR or any other computer values changed
significantly except for the IAC and the MAP.  The map pessure first dropped
along with the rpm going up, and then the IAC started going down.  the car
being in or out of gear does not seem to affect things excpet it dies easier
in gear (of course).  Also when it starts running good the engine is at 160
or so and has been there for a while, so things have been open loop for a
substantial peroid of time.
		Any help would be appreciated
		Roger